Hello, welcome
Your symptoms very much in favor of tinea or
fungal infection. On and Off itching, thighs and anal area, Blackening of area which are spreading. These are common symptoms of fungal infection only.
Fungal infection indeed is very problematic if it becomes recurrent.
1st of all You keep these precaution in mind
1. Dont keep the area wet at all . Use powder frequently to keep it dry
2. Avoid itching and don't scratch it
3. Change the under garments
4. Don't apply and general or steroid cream like betnovate etc
5. Don't stop the medicine once you cure. Continue medicine for long time to completely kill the fungal
6. Avoid
excessive sweating and wet cloths
7. Check diabetes and thyroid it is really recurrent even after proper treatment.
Now treatment part
1.
Ketoconazole cream tab +terbinafine 250 mg for 2 month
2. Terbinafine cream +
fluconazole 150 mg twice in week for 2 month
3. Tab
itraconazole 200 mg twice in a day+ any cream for 1 month
4. For itching take levocitrizine 10 mg twice in a day.
these are treatment combinations. continue it